ucm2: Intel/sof-hda-dsp: Create ALSA config file for

If the HDMI PCM index (3-5) is found in iec61937-pcm list of the card's
components list then use the HdmiPCM/HdmiPCMSave macros to create the
configuration file.

The PCMs that will be created are:
aplay -L | grep hdmi

hdmi:CARD=sofhdadsp,DEV=0
hdmi:CARD=sofhdadsp,DEV=1
hdmi:CARD=sofhdadsp,DEV=2

Audio servers (Pulseaudio, Pipewrire) or applications then can use these for
bytestream passthrough, for example:
mplayer -ao alsa:device=hdmi=sofhdadsp,DEV=0 -ac hwdts <video with dts>

Closes: alsa-project#411
Signed-off-by: Peter Ujfalusi <[email protected]>
Signed-off-by: Jaroslav Kysela <[email protected]>

ucm2/Intel/sof-hda-dsp/sof-hda-dsp.conf

@@ -1,10 +1,20 @@
 Syntax 6
 
-Define.DeviceMic "Mic"
-Define.DeviceDmic ""
-
 Include.card-init.File "/lib/card-init.conf"
 
+Define {
+	DeviceMic "Mic"
+	DeviceDmic ""
+	Iec61937Pcms1 ""
+}
+
+DefineRegex {
+	Iec61937Pcms {
+		Regex "iec61937-pcm:(([0-9]+(,))*[0-9]+)"
+		String "${CardComponents}"
+	}
+}
+
 If.devdmic {
 	Condition {
 		Type String
@@ -115,3 +125,41 @@ If.Capture {
 		cset "name='Capture Switch' on"
 	]
 }
+
+Include.hdmi-pcm.File "/common/pcm/hdmi.conf"
+
+If.Hdmi3-iec61937 {
+	Condition {
+		Type RegexMatch
+		Regex "((^|,)[3](,|$))"
+		String "${var:Iec61937Pcms1}"
+	}
+	True.Macro.hdmi3.HdmiPCM { Device 3 Index 0 }
+}
+
+If.Hdmi4-iec61937 {
+	Condition {
+		Type RegexMatch
+		Regex "((^|,)[4](,|$))"
+		String "${var:Iec61937Pcms1}"
+	}
+	True.Macro.hdmi4.HdmiPCM { Device 4 Index 1 }
+}
+
+If.Hdmi5-iec61937 {
+	Condition {
+		Type RegexMatch
+		Regex "((^|,)[5](,|$))"
+		String "${var:Iec61937Pcms1}"
+	}
+	True.Macro.hdmi5.HdmiPCM { Device 5 Index 2 }
+}
+
+If.HdmiIec61937 {
+	Condition {
+		Type RegexMatch
+		Regex "((^|,)[345](,|$))"
+		String "${var:Iec61937Pcms1}"
+	}
+	True.Macro.save_hdmi_cfg.HdmiPCMSave { Name "42-sof-hdmi" }
+}